Being able to see the modification dates of notes at a glance is one of the very few features I'm still missing a lot from nvALT. Did I last revise a note 3 weeks ago? 3 months ago? 3 years ago? To me, this information is very useful.

In my experience, the modification dates of files are very reliable, unless you do something very wacky like transfer them all over FTP with a client that is not written very well.